uk.ac.ed.epcc.safe.accounting.expr.parse

Class ExpressionLexer

java.lang.Object

uk.ac.ed.epcc.safe.accounting.expr.parse.ExpressionLexer

All Implemented Interfaces:

ExpressionParser.Lexer

public class ExpressionLexer
extends java.lang.Object
implements ExpressionParser.Lexer

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ExpressionLexer.LiteralExpressionLexTarget

Constructor Summary

Constructors

Constructor and Description
ExpressionLexer(uk.ac.ed.epcc.webapp.AppContext conn, java.lang.String text)

Method Summary

Methods

Modifier and Type	Method and Description
void	back()
java.lang.Object	getLVal() Method to retrieve the semantic value of the last scanned token.
void	yyerror(java.lang.String s) Entry point for error reporting.
int	yylex() Entry point for the scanner.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ExpressionLexer

public ExpressionLexer(uk.ac.ed.epcc.webapp.AppContext conn,
               java.lang.String text)

Method Detail

back

public void back()

getLVal

public java.lang.Object getLVal()

Description copied from interface: ExpressionParser.Lexer

Method to retrieve the semantic value of the last scanned token.

Specified by:

getLVal in interface ExpressionParser.Lexer

Returns:

the semantic value of the last scanned token.

yyerror

public void yyerror(java.lang.String s)

Description copied from interface: ExpressionParser.Lexer

Entry point for error reporting. Emits an error in a user-defined way.

Specified by:

yyerror in interface ExpressionParser.Lexer

Parameters:

s - The string for the error message.

yylex

public int yylex()
          throws LexException

Description copied from interface: ExpressionParser.Lexer

Entry point for the scanner. Returns the token identifier corresponding to the next token and prepares to return the semantic value of the token.

Specified by:

yylex in interface ExpressionParser.Lexer

Throws:

LexException

Returns:

the token identifier corresponding to the next token.